KR20030094050A - Optical recording and playback method, and optical recording media - Google Patents

Optical recording and playback method, and optical recording media Download PDF

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Publication number
KR20030094050A
KR20030094050A KR10-2003-0034738A KR20030034738A KR20030094050A KR 20030094050 A KR20030094050 A KR 20030094050A KR 20030034738 A KR20030034738 A KR 20030034738A KR 20030094050 A KR20030094050 A KR 20030094050A
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South Korea
Prior art keywords
optical recording
layer
recording
recording medium
optical
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KR10-2003-0034738A
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Korean (ko)
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KR100678300B1 (en
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이노우에히로야스
미시마고지
아오시마마사키
히라타히데키
우츠노미야하지메
아라이히토시
다나카요시토모
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티디케이가부시기가이샤
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Publication of KR100678300B1 publication Critical patent/KR100678300B1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00455—Recording involving reflectivity, absorption or colour changes
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Abstract

본 발명은 광기록재생방법과 광기록매체에 관한 것으로서, 광기록매체(10)는 기판(12)상에 기록되어야 할 정보에 따라서 강도 변조된 에너지인 레이저빔에 의해 상태 변화되는 한쌍의 유전체층(14A, 14B) 및 이것들에 끼워진 기록보조층(16)으로 이루어진 기록층(18)을 갖고 있고, 기록보조층(16)은 Sn, Ti, Si, Bi, Ge, C등 중 어느 하나의 원소를 주성분으로 하고, 유전체층(14A, 14B)에 있어서의 모재로서의 유전체재는 ZnS, SiO2, AlN, Ta2O5등 중 1종류의 재료를 포함하여 구성되어 있는 것을 특징으로 한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording reproducing method and an optical recording medium, wherein the optical recording medium 10 includes a pair of dielectric layers whose state is changed by a laser beam that is intensity modulated according to information to be recorded on the substrate 12 ( 14A, 14B and a recording auxiliary layer 16 sandwiched therebetween, and the recording auxiliary layer 16 is formed of any one of Sn, Ti, Si, Bi, Ge, C, and the like. As a main component, the dielectric material as the base material in the dielectric layers 14A and 14B includes one of ZnS, SiO 2 , AlN, Ta 2 O 5 , and the like.

Description

광기록재생방법과 광기록매체{OPTICAL RECORDING AND PLAYBACK METHOD, AND OPTICAL RECORDING MEDIA}Optical recording and reproducing method and optical recording medium {OPTICAL RECORDING AND PLAYBACK METHOD, AND OPTICAL RECORDING MEDIA}

본 발명은 광기록매체와 이를 이용한 광기록재생방법에 관한 것이다.The present invention relates to an optical recording medium and an optical recording and reproducing method using the same.

종래부터 디지털데이터를 기록하기 위한 기록매체로서, CD(Compact Disc)이나 DVD(Digital Versatile Disc)로 대표되는 광기록매체가 널리 이용되고 있다. 상기 광기록매체는 CD-ROM(Read Only Memory)이나 DVD-ROM과 같이 데이터의 추기(追記)나 개서(改書)를 할 수 없는 타입의 광기록매체(ROM형 광기록매체)와, CD-R(Recordable)이나 DVD-R과 같이 데이터의 추기는 가능하지만 데이터의 개서는 할 수 없는 타입의 광기록매체(추기형 광기록매체)와, CD-RW(Rewritable)이나 DVD-RW와 같이 데이터의 개서가 가능한 타입의 광기록 매체(개서형 광기록매체)로 크게 구분할 수 있다.Background Art Conventionally, as a recording medium for recording digital data, an optical recording medium represented by a compact disc (CD) or a digital versatile disc (DVD) has been widely used. The optical recording medium is an optical recording medium (ROM type optical recording medium) of a type which cannot write or rewrite data such as a CD-ROM (Read Only Memory) or a DVD-ROM, and a CD. -Recordable (Recordable) or DVD-R data recording is possible but not rewritable type of optical recording media (recordable optical recording media), CD-RW (Rewritable) or DVD-RW The optical recording medium (rewritable optical recording medium) of the type which can rewrite data can be largely divided.

널리 알려져 있는 바와 같이, ROM형 광기록매체에 있어서는 제조단계에 있어서 기판에 형성되는 프리피트에 의해 데이터가 기록되는 것이 일반적이고, 개서형 광기록매체에 있어서는, 예를 들면 기록층의 재료로서 상변화 재료가 이용되고, 그 상 상태의 변화에 기초한 광학 특성의 변화를 이용하여 데이터가 기록되는 것이 일반적이다.As is widely known, data is recorded by a prepit formed on a substrate in a manufacturing step in a ROM type optical recording medium, and in a rewritable optical recording medium, for example, as a material of a recording layer. It is common for a change material to be used and data to be recorded using a change in optical properties based on a change in the state of the phase.

이에 대해, 추기형 광기록매체에 있어서는 기록층의 재료로서 시아닌계 색소, 프타로시아닌계 색소, 아조색소 등의 유기색소가 이용되고, 그 화학적 변화(경우에 따라서는 화학적 변화뿐만 아니라 물리적 변형을 수반하는 것이 있다)에 기초한 광학특성의 변화를 이용하여 데이터가 기록되는 것이 일반적이다.In contrast, in the recordable optical recording medium, organic dyes such as cyanine dye, phthalocyanine dye and azo dye are used as the material of the recording layer, and the chemical change (in some cases, not only chemical change but also physical deformation). It is common for data to be recorded using a change in optical characteristics based on the "

그러나, 유기색소는 일광 등의 조사에 의해 열화되기 때문에 기록층의 재료로서 유기색소를 이용한 경우, 장기간의 보존에 대한 신뢰성을 높이는 것은 용이하지 않다. 추기형 광기록 매체에 있어서 장기간의 보존에 대한 신뢰성을 높이기 위해서는 기록층을 유기색소 이외의 재료에 의해 구성하는 것이 바람직하다. 기록층을 유기색소 이외의 재료에 의해 구성한 예로서는, 일본 특개소62-204442호 공보에 기재되어 있는 바와 같이 2층의 반응층을 적층하여 이것을 기록층으로서 이용하는 기술이 알려져 있다.However, since organic dyes deteriorate by irradiation with sunlight or the like, when organic dyes are used as the material of the recording layer, it is not easy to increase the reliability for long term storage. In the write-once optical recording medium, in order to increase the reliability for long-term storage, it is preferable that the recording layer is made of a material other than organic dye. As an example in which the recording layer is made of a material other than an organic dye, a technique of laminating two reaction layers as described in Japanese Patent Laid-Open No. 62-204442 and using this as a recording layer is known.

한편, 최근 데이터의 기록 밀도가 높아지고, 또 매우 높은 데이터 전송 레이트를 실현할 수 있는 차세대형 광기록매체가 제안되어 있다. 이와 같은 차세대형 광기록매체에 있어서는 대용량·고데이터 전송 레이트를 실현하기 위해, 필연적으로 데이터의 기록·재생에 이용하는 레이저빔의 빔스폿 직경을 매우 작게 압축하지 않으면 안된다. 여기서, 빔스폿 직경을 작게 압축하기 위해서는 레이저빔을 집속하기 위한 대물렌즈의 개구수(NA)를 0.7이상, 예를 들면 0.85정도까지 크게 하고, 또 레이저빔의 파장(λ)을 450nm이하, 예를 들면 400nm정도까지 짧게 할 필요가 있다.On the other hand, next-generation optical recording media have been proposed in which data recording density is high and a very high data transfer rate can be realized. In such a next-generation optical recording medium, in order to realize a large capacity and a high data transfer rate, a beam spot diameter of a laser beam used for recording and reproducing data must be compressed very small. Here, in order to compress the beam spot diameter small, the numerical aperture NA of the objective lens for focusing the laser beam is increased to 0.7 or more, for example, about 0.85, and the wavelength λ of the laser beam is 450 nm or less. For example, it is necessary to shorten it to about 400 nm.

그러나, 레이저빔을 집속하기 위한 대물렌즈를 고NA화하면 광기록매체의 휘어짐이나 경사의 허용도, 즉 틸트마진이 매우 작아지는 문제가 생긴다. 틸트마진(T)은 기록·재생에 이용하는 레이저빔의 파장(λ), 레이저빔의 광로가 되는 광투과층(투명기체)의 두께를 “d”로 하면 하기 수학식 1에 의해 나타낼 수 있다.However, when the objective lens for focusing the laser beam is increased, the problem of the warp or tilt of the optical recording medium, i.e., the tilt margin, becomes very small. The tilt margin T can be expressed by Equation 1 below when the wavelength? Of the laser beam used for recording and reproducing and the thickness of the light transmitting layer (transparent gas) serving as the optical path of the laser beam are "d".

상기 수학식 1에서 명확해진 바와 같이, 틸트마진은 대물렌즈의 NA가 클수록 작아진다. 또, 파면수차(코머수차)가 발생하는 광투과층(투명기체)의 굴절율을 “n”, 경사각을 “θ”로 하면 파면수차계수(W) 는 하기 수학식 2에 의해 나타낼 수 있다.As apparent from Equation 1, the tilt margin decreases as the NA of the objective lens increases. Further, when the refractive index of the light transmitting layer (transparent gas) generating wavefront aberration (commercial aberration) is "n" and the inclination angle is "θ", the wavefront aberration coefficient W can be expressed by the following equation (2).

상기 수학식 1 및 수학식 2로부터 명확해진 바와 같이 틸트마진을 크게 하고, 또 코머수차의 발생을 억제하기 위해서는 기록·재생에 이용하는 레이저빔이 입사하는 광투과층(투명기체)의 두께(d)를 작게 하는 것이 매우 유효하다.As apparent from Equations 1 and 2, in order to increase the tilt margin and suppress the occurrence of coma aberration, the thickness d of the light transmitting layer (transparent gas) to which the laser beam used for recording and reproduction is incident It is very effective to make it small.

이와 같은 이유에서 차세대형 광기록매체에서는 충분한 틸트마진을 확보하면서 코머수차의 발생을 억제하기 위해 광투과층(투명기체)의 두께를 100㎛ 정도까지 얇게 하는 것이 요구된다. 이 때문에 차세대형 광기록매체에 있어서는 CD나 DVD 등, 현행의 광기록매체와 같이 광투과층(투명기체)상에 기록층 등을 형성하는 것은 곤란하며, 기체상에 형성한 기록층 등의 위에 스핀코트법 등으로 얇은 수지층을 광투과층(투명기체)으로서 형성하는 방법이 검토되고 있다. 따라서, 차세대형 광기록매체의 제작에 있어서는 광입사면측에서 순차 성막이 실시되는 현행의 광기록매체와는 달리, 광입사면과는 반대측에서 순차 성막이 실시되게 된다.For this reason, in the next-generation optical recording media, it is required to reduce the thickness of the light transmitting layer (transparent gas) to about 100 μm in order to secure sufficient tilt margin and suppress the generation of comer aberration. Therefore, in the next generation optical recording medium, it is difficult to form a recording layer or the like on a light transmitting layer (transparent gas) like a current optical recording medium such as a CD or a DVD. The method of forming a thin resin layer as a light transmitting layer (transparent gas) by the spin coat method etc. is examined. Therefore, in the production of the next generation optical recording medium, unlike the current optical recording medium in which film formation is performed sequentially on the light incidence surface side, film formation is performed on the side opposite to the light incidence side surface.

그러나, 차세대형 광기록매체와 같이 기체상에 형성되는 기록층을 2층의 반응층에 의해 구성한 경우, CD나 DVD 등, 현행의 광기록매체와 같이 광투과층(투명기체)에 형성되는 기록층을 2층의 반응층에 의해 구성한 경우에 비해 신호재생시에 생기는 노이즈의 레벨이 커지기 쉬운(C/N비가 작아지기 쉬운)문제가 분명해졌다.However, in the case where the recording layer formed in the gaseous state, such as the next-generation optical recording medium, is composed of two layers of reaction layers, the recording is formed in the light transmitting layer (transparent gas) like the current optical recording medium such as CD or DVD. Compared with the case where the layer is composed of two layers of reaction layers, the problem that the level of noise generated at the time of signal reproduction becomes easy (the C / N ratio tends to be small) becomes clear.

한편, 최근 지구환경으로의 관심이 높아져 광기록매체의 기록층의 재료로서도 보다 환경부하가 작은 재료를 선택하는 것이 바람직하다. 또, 장기간의 보존에 대한 신뢰성을 높이기 위해서는 광기록매체의 재료로서는 부식·변질 등에 대해 충분한 내성을 갖는 재료를 선택하는 것이 바람직하다.On the other hand, as the interest in the global environment has recently increased, it is desirable to select a material having a lower environmental load as a material for the recording layer of the optical recording medium. In addition, in order to increase the reliability for long term storage, it is preferable to select a material having sufficient resistance against corrosion, deterioration, etc. as the material of the optical recording medium.

본 발명은 차세대형 광기록매체의 기록재생 시스템에 있어서, 특히 유용해진 새로운 광기록재생방법과 광기록매체를 제공하는 것을 목적으로 한다.An object of the present invention is to provide a novel optical recording and reproducing method and an optical recording medium which are particularly useful in a recording and reproducing system of a next-generation optical recording medium.

도 1은 본 발명의 실시형태의 제 1 예에 따른 광기록매체를 도시한 모식도,1 is a schematic diagram showing an optical recording medium according to a first example of an embodiment of the present invention;

도 2는 본 발명의 실시형태의 제 2 예에 따른 광기록매체를 도시한 모식도,2 is a schematic diagram showing an optical recording medium according to a second example of an embodiment of the present invention;

도 3은 본 발명의 실시형태의 제 3 예에 따른 광기록매체를 도시한 모식도,3 is a schematic diagram showing an optical recording medium according to a third example of an embodiment of the present invention;

도 4a는 예 1의 광기록매체에서의 미기록 부분의 X선회절결과를 나타내는 선도,4A is a diagram showing an X-ray diffraction result of an unrecorded portion in the optical recording medium of Example 1;

도 4b는 동일 기록 부분의 X선회절결과를 나타내는 선도,4B is a graph showing the X-ray diffraction results of the same recording portion;

도 5a는 예 4의 광기록매체에서의 미기록부분의 X선회절결과를 나타내는 선도,5A is a graph showing the results of X-ray diffraction of the unrecorded portion in the optical recording medium of Example 4;

도 5b는 예 4의 광기록매체에서의 기록부분의 X선회절결과를 나타내는 선도이다.5B is a graph showing the X-ray diffraction results of the recording portion in the optical recording medium of Example 4. FIG.

*도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

10, 30, 40 : 광기록매체 12 : 기판10, 30, 40: optical recording medium 12: substrate

14 : 기록보조층 16A, 16B : 유전체층14: recording auxiliary layer 16A, 16B: dielectric layer

18 : 기록층 20 : 광투과층18: recording layer 20: light transmitting layer

22 : 그루브 24 : 랜드22: groove 24: land

본 발명자는 예의 연구 결과, Sn이나 ZnS 등의 환경배려형 재료를 이용하여 간단한 막 구성으로 양호한 광기록·재생이 가능한 것을 발견했다.As a result of intensive studies, the inventors have found that good optical recording and reproduction can be achieved with a simple film structure using environmentally friendly materials such as Sn and ZnS.

즉, 이하의 본 발명에 의해 상기 목적을 달성하는 것이다.That is, the said object is achieved by the following this invention.

(1) 기판상에 적어도 기록보조층과 유전체층을 인접하여 존재시켜 형성한 기록층에, 외부로부터 기록되어야 할 정보에 따라서 강도 변조된 레이저빔을 조사하고, 상기 유전체층의 적어도 일부를 상태변화시키는 것에 의해 광학 특성을 변화시켜 정보를 기록하고, 또 이 광학특성의 변화에 따른 반사율의 변화를 판독하여, 상기 정보를 재생하는 것을 특징으로 하는 광기록재생방법.(1) Irradiating a laser beam modulated in accordance with information to be recorded from the outside to a recording layer formed by adjoining at least a recording auxiliary layer and a dielectric layer on a substrate, and changing at least a part of the dielectric layer in a state. And recording the information by changing the optical characteristic, and reading the change of the reflectance according to the change of the optical characteristic to reproduce the information.

(2) 상기 유전체층의 상태 변화가 결정성장인 것을 특징으로 하는 (1)의 광기록재생방법.(2) The optical recording and reproducing method according to (1), wherein the state change of the dielectric layer is crystal growth.

(3) 기판과, 적어도 상기 기판상에 인접하여 설치된 기록보조층 및 유전체층을 포함하는 기록층으로 이루어지며, 상기 유전체층은 상태변화를 일으키는 모재를 포함하며, 상기 기록보조층은 상태변화촉진재를 포함하여 이루어지며, 여기에 외부로부터 기록되어야 할 정보에 따라서 강도 변조된 레이저빔이 조사되고, 상기 모재가 상태 변화하는 것에 의해 레이저빔에 의해 판독 가능하게 반사율이 변화되고, 상기 정보의 재생이 가능해진 것을 특징으로 하는 광기록매체.(3) a recording layer comprising a substrate, and at least a recording auxiliary layer and a dielectric layer disposed adjacent to the substrate, wherein the dielectric layer includes a base material causing a change in state, and the recording auxiliary layer includes a state change promoting material. The laser beam is intensity modulated in accordance with the information to be recorded from the outside, and reflectance is readable by the laser beam by the state change of the base material, and the information can be reproduced. An optical recording medium, characterized in that the done.

(4) 상기 기록보조층은 Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, Mg, Mn, Ag, 중에서 선택되는 원소의 적어도 하나를 주성분으로 포함하는 것을 특징으로 하는 (3)의 광기록매체.(4) The recording auxiliary layer includes at least one of an element selected from Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, Mg, Mn, Ag as a main component. (3) The optical recording medium.

(5) 상기 유전체층은 Al2O3, AlN, ZnO, ZnS, GeN, GeCrN, CeO2, SiO, SiO2, Si3N4, Ta2O5및 SiC로 이루어진 군에서 선택되는 적어도 1종류의 유전체재를 주성분으로 하는 것을 특징으로 하는 (3) 또는 (4)의 광기록매체.(5) The dielectric layer is at least one selected from the group consisting of Al 2 O 3 , AlN, ZnO, ZnS, GeN, GeCrN, CeO 2 , SiO, SiO 2 , Si 3 N 4 , Ta 2 O 5, and SiC An optical recording medium according to (3) or (4), characterized by a dielectric material as a main component.

(6) 기판과, 적어도 상기 기판상에 인접하여 설치된 기록보조층 및 유전체층을 포함하는 기록층으로 이루어지며, 상기 기록보조층은 Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, Mg, Mn, Ag 중에서 선택되는 적어도 하나의 원소를 주성분으로 포함하는 것을 특징으로 하는 광기록매체.(6) a recording layer comprising a substrate, and at least a recording auxiliary layer and a dielectric layer provided adjacent to the substrate, wherein the recording auxiliary layer is Sn, Ti, Si, Bi, Ge, C, V, W, Zr And Zn, Mg, Mn, Ag, and at least one element selected from the group consisting of an optical recording medium.

(7) 상기 유전체층은 Al2O3, AlN, ZnO, ZnS, GeN, GeCrN, CeO2, SiO, SiO2, Si3N4, Ta2O5및 SiC로 이루어진 군에서 선택되는 적어도 1종류의 유전체재를 주성분으로 하는 것을 특징으로 하는 (6)의 광기록매체.(7) The dielectric layer is at least one member selected from the group consisting of Al 2 O 3 , AlN, ZnO, ZnS, GeN, GeCrN, CeO 2 , SiO, SiO 2 , Si 3 N 4 , Ta 2 O 5, and SiC. An optical recording medium according to (6), characterized in that the dielectric material is a main component.

(발명의 실시형태)Embodiment of the Invention

이하 본 발명의 실시형태의 예를 도면을 참조하여 상세히 설명한다.Hereinafter, an example of embodiment of this invention is described in detail with reference to drawings.

이 실시형태의 예에 따른 광기록재생방법에 이용하는 광기록매체(10)는 추기형이고, 도 1에 도시된 바와 같이, 기판(12)과 기판(12)상에 기록보조층(14) 및 그 양측에 인접하는 유전체층(16A, 16B)을 갖고 기록층(18)이 설치되고, 그 위에 광투과층(20)이 설치되는 것에 의해 구성되어 있다. 또, 광기록매체(10)의 중앙 부분에는 구멍이 설치되어 있다. 이와 같은 구조를 갖는 광기록매체(10)에 대해서는 광투과층(20)의 측에서 레이저빔(LB)을 조사하는 것에 의해 데이터의 기록/재생이 실시된다. 또, 기록보조층(14)의 한쪽에만 유전체층(16A 또는 16B)을 설치해도 좋다.The optical recording medium 10 used in the optical recording and reproducing method according to the example of this embodiment is a recordable type, and as shown in FIG. 1, the recording auxiliary layer 14 and the substrate 12 and the substrate 12 on the substrate 12; The recording layer 18 is provided with the dielectric layers 16A and 16B adjacent to both sides, and the light transmitting layer 20 is provided thereon. In addition, a hole is provided in the center portion of the optical recording medium 10. In the optical recording medium 10 having such a structure, data recording / reproducing is performed by irradiating the laser beam LB from the side of the light transmitting layer 20. In addition, the dielectric layer 16A or 16B may be provided only on one side of the recording auxiliary layer 14.

기판(12)은 광기록매체(10)에 요구되는 기계적 강도를 확보하기 위한 기체로서의 역할을 하고, 그 표면에는 그루브(22) 및/또는 랜드(24)가 설치되어 있다. 상기 그루브(22) 및 랜드(24)는 데이터의 기록 및 재생을 실시하는 경우의 레이저빔의 가이드트랙으로서의 역할을 한다.The substrate 12 serves as a gas for securing the mechanical strength required for the optical recording medium 10, and grooves 22 and / or lands 24 are provided on the surface thereof. The grooves 22 and the lands 24 serve as guide tracks for the laser beam in the case of recording and reproducing data.

기판(12)의 두께는 약 1.1mm로 설정되고, 그 재료로서는 여러가지 재료를 사용하는 것이 가능하고, 예를 들면 유리, 세라믹스 또는 수지를 사용할 수 있다.이들 중, 성형의 용이성의 관점에서 수지가 바람직하다. 이와 같은 수지로서는 폴리카보네이트수지, 아크릴수지, 에폭시수지, 폴리스틸렌수지, 폴리에틸렌수지, 폴리프로필렌수지, 실리콘수지, 불소계수지, ABS수지, 우레탄수지 등을 예로 들 수 있다. 그 중에서도 가공성, 광학특성 등의 점에서 폴리카보네이트수지가 특히 바람직하다.The thickness of the board | substrate 12 is set to about 1.1 mm, and various materials can be used as the material, for example, glass, ceramics, or resin can be used. Among these, resin is preferable from the viewpoint of the ease of shaping | molding. desirable. Examples of such resins include polycarbonate resins, acrylic resins, epoxy resins, polystyrene resins, polyethylene resins, polypropylene resins, silicone resins, fluorine resins, ABS resins, urethane resins, and the like. Especially, polycarbonate resin is especially preferable at the point of workability, an optical characteristic, etc.

상기 유전체층(16A, 16B)은 모재로서 레이저빔 조사 등의 에너지에 의해 광반사율 등의 광학특성이 변화되는 상태변화재료를 포함하여 구성되어 있다.The dielectric layers 16A and 16B are composed of a state change material whose optical properties such as light reflectance are changed by energy such as laser beam irradiation as a base material.

상기 모재로서의 유전체재는 상태변화를 일으키는 재료이면 특별히 한정되지 않고, 예를 들면 산화물, 황화물, 질화물 또는 이것들의 조합을 주성분으로서 이용할 수 있다. 보다 구체적으로는 Al2O3, AlN, ZnO, ZnS, GeN, GeCrN, CeO2, SiO, SiO2, Si3N4, Ta2O5, SiC로 이루어진 군에서 선택되는 적어도 1종류의 유전체재를 주성분으로 하는 것이 바람직하고, ZnS-SiO2로 이루어진 유전체를 주성분으로 하는 것이 더 바람직하다.The dielectric material as the base material is not particularly limited as long as it is a material causing a change in state. For example, an oxide, a sulfide, a nitride, or a combination thereof can be used as a main component. More specifically, at least one dielectric material selected from the group consisting of Al 2 O 3 , AlN, ZnO, ZnS, GeN, GeCrN, CeO 2 , SiO, SiO 2 , Si 3 N 4 , Ta 2 O 5 , SiC It is preferable to have a as a main component, and it is more preferable to have a dielectric composed of ZnS-SiO 2 as a main component.

또, 「유전체재를 주성분으로 한다」는 것은 상기 유전체재의 함유율이 가장 큰 것을 말한다. 또, 「ZnS-SiO2」라는 것은 ZnS와 SiO2의 혼합물을 의미한다.In addition, "the dielectric material as a main component" means the content rate of the said dielectric material is largest. Further, it is called "ZnS-SiO 2" means a mixture of ZnS and SiO 2.

또, 유전체재의 층두께는 특별히 한정되지 않지만, 5∼200nm인 것이 바람직하다. 이 층두께가 5nm 미만이면 모재의 충분한 상태 변화가 있다고 해도 층전체로서의 광반사율 등의 광학 특성의 충분한 변화가 요구되지 않을 뿐만 아니라 신호로서의 C/N이 불충분해진다. 한편, 층두께가 200nm을 초과하면 성막시간이 길어져생산성이 저하할 우려가 있고, 또 유전체층(16A, 16B)이 갖는 응력에 의해 크랙이 발생할 우려가 있다. 또, 상기 기록보조재층(14)의 영향이 미치지 않는 부분이 남는 것도 생각할 수 있다.The thickness of the dielectric material is not particularly limited, but is preferably 5 to 200 nm. If the layer thickness is less than 5 nm, even if there is a sufficient state change of the base material, not only a sufficient change of optical properties such as light reflectance as the whole layer is required, but also C / N as a signal becomes insufficient. On the other hand, when the layer thickness exceeds 200 nm, the film formation time may be long, resulting in a decrease in productivity, and a crack may occur due to the stress of the dielectric layers 16A and 16B. It is also conceivable that a portion left unaffected by the recording auxiliary material layer 14 remains.

상기 기록보조층(14)은 모재의 반응을 촉진시키는 층이며, 상기와 같이 적어도 그 한쪽에 유전체층(16A, 16B)이 인접하여 구성되지만, 소정 이상의 파워를 갖는 레이저빔이 조사되면 그 열에 의해 기록보조층(14)을 구성하는 원소가 유전체층(16A, 16B)에 영향을 미치고, 유전체층(16A, 16B)을 구성하는 층이 부분적 또는 전체적으로 상태변화(예를 들면 아몰퍼스가 결정화로 이행)하는 것에 의해 기록 마크가 된다. 이 때, 기록층(18)에 있어서 기록마크가 형성된 부분과 그 이외의 부분에서는 재생광에 대한 광학특성이 크게 다르므로, 이를 이용하여 데이터의 기록·재생을 실시할 수 있다.The recording auxiliary layer 14 is a layer which promotes the reaction of the base material, and the dielectric layers 16A and 16B are formed adjacent to at least one of the above as described above. The elements constituting the auxiliary layer 14 affect the dielectric layers 16A and 16B, and the layers constituting the dielectric layers 16A and 16B partially or totally change state (for example, amorphous transitions to crystallization). It becomes a recording mark. At this time, in the recording layer 18, the portion where the recording mark is formed and the portion other than that are substantially different in optical characteristics with respect to the reproduction light, so that data can be recorded and reproduced using this.

또, 기록보조층에 포함되는 기록보조재 자체의 상태변화(예를 들면 결정성장)를 수반해도 좋다. 이 경우, 이 변화에 의해 C/N의 향상을 기대할 수 있다.It may also be accompanied by a change of state (for example, crystal growth) of the recording auxiliary material itself contained in the recording auxiliary layer. In this case, improvement of C / N can be expected by this change.

상기 기록보조층(14)은 Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, Mg, Mn, Ag 중 적어도 하나에서 선택되는 원소를 주성분으로 한다.The recording auxiliary layer 14 has an element selected from at least one of Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, Mg, Mn, Ag as a main component.

여기서 말하는 주성분은 기록보조층(14)을 구성하는 원소의 50%이상을 차지하는 것이 바람직하고, 보다 바람직하게는 80원자%이다.It is preferable that the main component referred to here occupy 50% or more of the elements constituting the recording auxiliary layer 14, and more preferably 80 atomic%.

50원자% 이하가 되면 유전체재료을 변화시키는 효과가 불충분해지고, C/N이 작아져버린다. 또는 기록감도가 나빠지고, 높은 레이저파워로 기록할 필요가 있으므로 막 자체의 파괴 등이 생기기 쉽고, 보존 신뢰성이 악화된다.If the content is 50 atomic% or less, the effect of changing the dielectric material becomes insufficient, and the C / N becomes small. Alternatively, the recording sensitivity deteriorates, and recording with a high laser power tends to cause breakage of the film itself, resulting in poor storage reliability.

또, 유전체층의 상태 변화를 양호하게 실시하기 위해 필요해지는 레이저빔의 파워를 어느 정도 낮게 억제하기 위해서는 80원자%이상인 것이 바람직하다.Moreover, in order to suppress the power of the laser beam required for favorable state change of a dielectric layer to some extent, it is preferable that it is 80 atomic% or more.

상기 기록보조층(14)의 층두께는 레이저빔의 빔스폿이 조사되는 것에 의해 유전체층(16A, 16B)을 변화시키기 위해 충분한 층두께이고, 또 필요 이상으로 적층하면 보다 많은 열량이 필요해지기 때문에 1∼50nm인 것이 바람직하고, 2∼30nm인 것이 보다 바람직하다.The layer thickness of the recording auxiliary layer 14 is sufficient to change the dielectric layers 16A and 16B by irradiating a beam spot of the laser beam, and when stacked more than necessary, more heat is required. It is preferable that it is -50 nm, and it is more preferable that it is 2-30 nm.

광투과층(20)은 레이저빔의 입사면을 구성하고, 또 레이저빔의 광로가 되는 층이며, 그 두께로서는 10∼300㎛로 설정하는 것이 바람직하고, 50∼150㎛로 설정하는 특히 바람직하다. 광투과층(20)의 재료로서는 특별히 한정되지 않지만, 아크릴계나 에폭시계 등의 자외선경화형 수지를 이용하는 것이 바람직하다. 또, 자외선경화형 수지를 경화시켜 이루어진 막 대신에 광투과성 수지로 이루어진 광투과성 시트와 각종 접착제나 점착제를 이용하여 광투과층(20)을 형성해도 좋다.The light transmitting layer 20 constitutes an incident surface of the laser beam and serves as an optical path of the laser beam, and the thickness thereof is preferably set to 10 to 300 µm, particularly preferably 50 to 150 µm. . Although it does not specifically limit as a material of the light transmission layer 20, It is preferable to use ultraviolet curing resins, such as an acryl type and an epoxy type. Instead of the film formed by curing the ultraviolet curable resin, the light transmissive layer 20 may be formed using a light transmissive sheet made of a light transmissive resin and various adhesives and pressure sensitive adhesives.

계속해서 상기 광기록매체(10)의 제조방법의 일례에 대해 설명한다.Next, an example of the manufacturing method of the optical recording medium 10 will be described.

우선 그루브(22) 및 랜드(24)가 형성된 기판(12)상에 제 2(광입사측에서는 2번째가 됨) 유전체층(16B)을 형성한다. 제 2 유전체층(16B)의 형성에는, 예를 들면 제 2 유전체층(16B)의 구성원소를 포함한 화학종을 이용한 기상성장법을 이용할 수 있다. 이와 같은 기상성장법으로서는 예를 들면 진공증착법, 스퍼터링법 등을 들 수 있다.First, a second (second on the light incident side) dielectric layer 16B is formed on the substrate 12 on which the grooves 22 and the lands 24 are formed. For the formation of the second dielectric layer 16B, for example, a vapor phase growth method using a chemical species containing a component of the second dielectric layer 16B can be used. As such a vapor phase growth method, a vacuum deposition method, sputtering method, etc. are mentioned, for example.

계속해서 제 2 유전체층(16B)상에 기록보조층(14)을 형성한다. 이 기록보조층(14)도 제 2 유전체층(16B)과 동일하게 하여 기록보조층(14)의 구성 원소를 포함한 화학종을 이용한 기상성장법을 이용하여 형성할 수 있다. 또, 기록보조층(14)상에 제 1(광입사측에서는 1번째가 됨) 유전체층(16A)을 형성한다. 이 제 1 유전체층(16A)도 제 1 유전체층(16A)의 구성 원소를 포함한 화학종을 이용한 기상성장법을 이용하여 형성할 수 있다.Subsequently, the recording auxiliary layer 14 is formed on the second dielectric layer 16B. The recording auxiliary layer 14 can also be formed in the same manner as the second dielectric layer 16B by using a vapor phase growth method using chemical species containing the constituent elements of the recording auxiliary layer 14. A first (first on the light incidence side) dielectric layer 16A is formed on the recording auxiliary layer 14. The first dielectric layer 16A can also be formed using a vapor phase growth method using chemical species containing the constituent elements of the first dielectric layer 16A.

마지막으로, 제 1 유전체층(16A)상에 광투과층(20)을 형성한다. 광투과층(20)은 예를 들면 점도가 조정된 아크릴계 또는 에폭시계의 자외선경화형 수지를 스핀코트법 등에 의해 피막시키고, 자외선을 조사하여 경화하는 등의 방법에 의해 형성할 수 있다. 이상에 의해 광기록매체의 제조가 완료된다.Finally, the light transmitting layer 20 is formed on the first dielectric layer 16A. The light transmitting layer 20 can be formed by, for example, coating a acrylic or epoxy ultraviolet curable resin having a viscosity adjusted by a spin coat method or the like, and irradiating and curing ultraviolet rays. This completes the manufacture of the optical recording medium.

또, 상기 광기록매체의 제조방법은 상기 제조방법에 특별히 한정되지 않고, 공지된 광기록매체의 제조에 채용되는 제조기술을 이용할 수 있다.In addition, the manufacturing method of the optical recording medium is not particularly limited to the manufacturing method, and a manufacturing technique employed for manufacturing a known optical recording medium can be used.

계속해서, 상기 광기록매체(10)를 이용한 광기록 재생방법에 대해 설명한다.Subsequently, an optical recording / reproducing method using the optical recording medium 10 will be described.

광기록매체(10)에 대해, 소정의 출력을 갖는 레이저빔(LB)을 광투과층(20)측으로부터 입사하여 기록보조층(14)에 조사한다. 이 때, 레이저빔(LB)를 집속하기 위한 대물렌즈(26)의 개구수(NA)는 0.7이상, 특히 0.85정도인 것이 바람직하고, 레이저빔(LB)의 파장(λ)은 450nm이하, 특히 405nm정도인 것이 바람직하다. 이와 같이 하여 λ/NA〈640nm으로 하는 것이 바람직하다.With respect to the optical recording medium 10, a laser beam LB having a predetermined output is incident from the light transmitting layer 20 side and irradiated to the recording auxiliary layer 14. At this time, the numerical aperture NA of the objective lens 26 for focusing the laser beam LB is preferably 0.7 or more, particularly about 0.85, and the wavelength λ of the laser beam LB is 450 nm or less, particularly It is preferable that it is about 405 nm. In this manner, it is preferable to set? / NA < 640 nm.

이와 같은 레이저빔(LB)의 조사에 의해 기록보조층(14)을 구성하는 원소가 레이저빔(LB)에 의해 가열되고, 이들 원소가 인접하는 유전체층(16A, 16B)에 영향을 주어, 부분적 또는 전체적으로 상태변화(예를 들면 아몰퍼스로부터 결정으로의 이행)하여 기록 마크가 형성된다. 기록마크가 형성된 부분의 광학특성은 그 이외의 부분(미기록 영역)의 광학 특성과 충분히 다른 값이 된다. 따라서, 판독용 레이저빔을 조사했을 때의 기록마크 부분과 그 이외의 부분에서의 반사율의 상위에 의해 데이터의 재생을 할 수 있다. 즉, 광학특성의 변조를 이용하여 데이터의 기록·재생을 실시하는 것이 가능해진다.By the irradiation of the laser beam LB, the elements constituting the recording auxiliary layer 14 are heated by the laser beam LB, and these elements affect adjacent dielectric layers 16A, 16B, and partially or partially. In the state as a whole (for example, transition from amorphous to crystal), a recording mark is formed. The optical characteristics of the portion where the recording mark is formed are sufficiently different from the optical characteristics of the other portion (unrecorded region). Therefore, the data can be reproduced by the difference in reflectance between the recording mark portion and the other portion when the reading laser beam is irradiated. In other words, data can be recorded and reproduced by using the modulation of the optical characteristics.

본 발명은 이상의 실시태양에 한정되지 않고, 특허청구범위에 기재된 발명의 범위내에서 여러가지 변경이 가능하고, 이것들도 본 발명의 범위내에 포함되는 것은 물론이다.The present invention is not limited to the above embodiments, and various changes can be made within the scope of the invention described in the claims, and these are, of course, included in the scope of the invention.

예를 들면, 상기 실시태양에 따른 광기록매체(10)에 있어서는 기록보조층(14)이 제 1 및 제 2 유전체층(16A, 16B)사이에 끼워져 있지만, 도 2에 도시되는 실시형태의 제 2 예의 광기록매체(30)와 같이 유전체층(16A, 16B)의 한쪽을 생략하여 기록층(32)을 구성해도 관계없다.For example, in the optical recording medium 10 according to the above embodiment, although the recording auxiliary layer 14 is sandwiched between the first and second dielectric layers 16A and 16B, the second embodiment of the embodiment shown in FIG. As in the example of the optical recording medium 30, one of the dielectric layers 16A and 16B may be omitted to form the recording layer 32.

또, 상기 실시형태에 따른 광기록매체(10, 30)에 있어서는 기록보조층(14)이 단층으로 구성되어 있지만, 본 발명의 광기록매체는 이것에 한정되지 않고, 동일한 효과를 갖는 것이라면 2층 이상의 층으로 구성된 것이라도 좋다.In the optical recording mediums 10 and 30 according to the above embodiment, the recording auxiliary layer 14 is composed of a single layer. However, the optical recording medium of the present invention is not limited thereto, and two layers are provided as long as they have the same effect. It may be composed of the above layers.

또, 상기 실시형태에 이용하는 광기록매체(10, 30, 40)에 있어서, 기판(12)상에는 반사층이 구비되어 있지 않지만, 기록마크가 형성된 영역에서의 반사광의 레벨과 미기록영역의 반사광의 레벨을 충분히 크게 하기 위해 도 4에 도시된 광기록매체(50)와 같이 반사층(52)을 설치해도 좋다.In the optical recording mediums 10, 30, and 40 used in the above embodiments, the reflection layer is not provided on the substrate 12, but the level of the reflected light in the region where the recording mark is formed and the level of the reflected light in the unrecorded region are adjusted. In order to sufficiently enlarge, a reflective layer 52 may be provided, such as the optical recording medium 50 shown in FIG.

반사층(52)은 광투과층(20)측에서 입사되는 레이저빔을 반사하고, 다시 광투과층(20)으로부터 출사시키는 역할을 하고, 그 두께로서는 5∼300nm으로 설정하는것이 바람직하며, 10∼200nm으로 설정하는 것이 특히 바람직하다. 반사층(52)의 재료는 레이저빔을 반사할 수 있는 한 특별히 제한받지 않고, 예를 들면 Mg, Al, Ti, Cr, Fe, Co, Ni, Cu, Zn, Ge, Ag, Pt, Au 등을 이용할 수 있다. 이들 중, 높은 반사율을 갖기 때문에 Al, Au, Ag, Cu 또는 이것들의 합금(Ag와 Cu의 합금 등) 등의 금속재료를 이용하는 것이 바람직하다. 반사층(52)을 설치하는 것에 의해 광기록후에 다중간섭효과에 의해 높은 재생신호(C/N비)가 얻어지기 쉬워진다.The reflecting layer 52 serves to reflect the laser beam incident from the light transmitting layer 20 side, and to exit from the light transmitting layer 20 again. The thickness of the reflecting layer 52 is preferably set to 5 to 300 nm. It is particularly preferable to set it to 200 nm. The material of the reflective layer 52 is not particularly limited as long as it can reflect the laser beam. For example, Mg, Al, Ti, Cr, Fe, Co, Ni, Cu, Zn, Ge, Ag, Pt, Au, or the like is not limited. It is available. Of these, metal materials such as Al, Au, Ag, Cu, or alloys thereof (such as alloys of Ag and Cu) are preferably used because they have high reflectance. By providing the reflective layer 52, it is easy to obtain a high reproduction signal (C / N ratio) due to the multiple interference effect after optical recording.

(예 및 비교예)(Examples and Comparative Examples)

이하, 예를 이용하여 본 발명에 대해 더 구체적으로 설명하지만, 본 발명은 이들 예에 전혀 한정되지 않는다.Hereinafter, although an Example is used and this invention is demonstrated further more concretely, this invention is not limited to these examples at all.

[광기록매체의 준비][Preparation of optical recording medium]

(예1∼3)(Examples 1 to 3)

이하에 나타내는 순서에 의해 광기록매체를 제작했다.An optical recording medium was produced by the following procedure.

우선, 두께: 1.1mm, 직경: 120mm의 폴리카보네이트 기판을 스퍼터링장치에 설정하고, 이 폴리카보네이트기판의 광반사층(예 2만)상에 ZnS와 SiO2의 혼합물로 이루어진 제 2 유전체층, Sn으로 이루어진 상태변화촉진층, ZnS와 SiO2의 혼합물로 이루어진 제 1 유전체층(예 1, 2만)을 순차 스퍼터링법에 의해 형성했다.First, a polycarbonate substrate having a thickness of 1.1 mm and a diameter of 120 mm was set in the sputtering apparatus, and a second dielectric layer made of a mixture of ZnS and SiO 2 , Sn, was formed on the light reflection layer (Example 2 only) of the polycarbonate substrate. A first dielectric layer (1, 20,000 only) consisting of a state change promoting layer and a mixture of ZnS and SiO 2 was formed by a sequential sputtering method.

계속해서 제 1 유전체층상에 아크릴계 자외선경화형 수지를 스핀코트법에 의해 코팅하고, 이것에 자외선을 조사하여 광투과층(층두께: 100㎛)을 형성했다.Subsequently, an acrylic ultraviolet curable resin was coated on the first dielectric layer by spin coating, and ultraviolet light was irradiated to form a light transmitting layer (layer thickness: 100 µm).

또, 제 1 유전체층 및 제 2 유전체층에 있어서 ZnS와 SiO2의 몰비율은ZnS:SiO2=80:20이 되도록 했다.The molar ratio of ZnS and SiO 2 in the first dielectric layer and the second dielectric layer was such that ZnS: SiO 2 = 80: 20.

(예 4∼14)(Examples 4-14)

유전체층, 기판, 광투과층은 실시예 1과 동일하고, 기록보조층을 Sn이외의 각종 금속 또는 반금속으로서 광기록매체를 제작했다.The dielectric layer, the substrate, and the light transmitting layer were the same as those in Example 1, and the optical recording medium was fabricated using various recording metals or semimetals other than Sn.

(비교예 1∼3)(Comparative Examples 1 to 3)

예 4∼14에 대해 기록보조층의 재료를 바꾸었을뿐이고 그외는 동일 조건으로 하여 광기록매체를 제작했다.In Examples 4 to 14, only the material of the recording auxiliary layer was changed. Otherwise, the optical recording medium was produced under the same conditions.

[기록·재생][Recording and playback]

상기 광기록매체를 각각 제작하고, 각각을 광디스크평가장치(상품명: DDU1000, 펄스틱사제)를 설정했다. 그리고, 각 광기록매체에 대해, 기록에 이용하는 레이저빔의 파장을 청색파장역(405nm), 대물렌즈의 NA(개구수)를 0.85로 하고, 이 레이저빔을 기록헤드내의 집광렌즈로 광투과층측으로부터 광기록매체로 집광하여, 광기록을 실시했다.The optical recording mediums were each produced, and each set an optical disc evaluation device (trade name: DDU1000, manufactured by Pulsetic Inc.). For each optical recording medium, the wavelength of the laser beam used for recording is set to the blue wavelength range (405 nm) and the NA (the number of apertures) of the objective lens is 0.85, and the laser beam is used as the condensing lens in the recording head to transmit light. The optical recording medium was condensed from the optical recording medium to perform optical recording.

이 때의 기록 신호의 조건은 변조방식: (1, 7)RLL, 채널비트길이: 0.12㎛, 기록선 속도: 5.3m/s, 채널클럭: 66MHz, 기록신호:8T로 했다.The conditions of the recording signal at this time were modulation system: (1, 7) RRL, channel bit length: 0.12 m, recording line speed: 5.3 m / s, channel clock: 66 MHz, recording signal: 8T.

계속해서 각 예 및 각 비교예마다 제작한 기록보조층의 재료나 층두께 및 유전체층의 재료나 층두께가 다른 광기록매체에 대해, 앞에서 설명한 광디스크 평가장치를 이용하여 기록한 정보를 재생하고, 그 때의 재생신호의 C/N비의 값을 측정했다. 여기서, 재생장치에 있어서는 재생에 이용한 레이저빔의 파장은 405nm, 대물렌즈의 NA(개구수)를 0.85로 하고, 레이저빔출력은 0.3mW로 했다.Subsequently, the information recorded using the optical disk evaluation apparatus described above is reproduced for the optical recording medium having different materials and layer thicknesses of the recording auxiliary layer and the material or layer thickness of the dielectric layer produced in each example and each comparative example. The value of the C / N ratio of the reproduced signal of was measured. In the reproducing apparatus, the wavelength of the laser beam used for reproducing was 405 nm, the NA (number of apertures) of the objective lens was 0.85, and the laser beam output was 0.3 mW.

그 결과를 하기 표 1∼표 4에 나타낸다.The results are shown in Tables 1 to 4 below.

상기 표에 나타내는 결과로부터 명확해진 바와 같이 예 1∼18에서는 C/N비가 35dB이상으로 양호한 구성이 얻어지고, 이것들의 광기록매체를 이용하여 광기록·재생이 충분히 가능한 결과가 얻어졌다.As apparent from the results shown in the above table, in Examples 1 to 18, a good configuration with a C / N ratio of 35 dB or more was obtained, and a result capable of sufficiently optical recording and reproducing using these optical recording media was obtained.

예 1의 광기록매체의 기록·미기록부분을 투과형 전자현미경으로 관찰한 바, 기록부분에 ZnS 및 Sn의 결정화가 보였다. 또, X선회절로도 기록후에 ZnS 및 Sn의 결정화를 확인할 수 있었다.The recorded and unrecorded portions of the optical recording medium of Example 1 were observed with a transmission electron microscope, and crystallization of ZnS and Sn was observed in the recorded portions. X-ray diffraction also confirmed the crystallization of ZnS and Sn after recording.

이 X선회절에서는 X선은 Cu-Kα를 사용하고, 관전압=50kV, 관전류=300mA이다. 회절피크의 동정(同定)은 JCPDS카드를 조합했다. 예를 들면, β-Sn은 04-0673의 번호의 재료이며, 이를 조합하는 것으로 β-Sn의 회절의 위치를 알 수 있다.In this X-ray diffraction, the X-ray uses Cu-Kα, and the tube voltage is 50 kV and the tube current is 300 mA. Identification of the diffraction peaks was performed by combining JCPDS cards. For example, β-Sn is a material having a number of 04-0673, and by combining them, the position of diffraction of β-Sn can be known.

예 1 (ZnS-SiO2(80:20)/Sn/ZnS-SiO2(80:20)적층형)의 구조로 기록부분과 미기록부분을 X선회절에 의해 해석을 실시했다(도 4a, 도 4b 참조).Example 1 (ZnS-SiO 2 (80:20) / Sn / ZnS-SiO 2 (80:20) laminated type) structure was analyzed by X-ray diffraction (recorded portion and unrecorded portion) (FIGS. 4A and 4B). Reference).

미기록시(도 4a)에는 β-Sn의 회절피크와 ZnS의 브로드한 회절피크가 보이고, 이 때문에 Sn은 결정이며, ZnS은 아몰퍼스인 것을 알 수 있다. 기록 후(도 4b)는 ZnS의 날카로운 회절 피크가 강하게 보이게 되고, 결정화가 생기는 것을 알 수 있다. 또, Sn에 관해서는 β-Sn의 회절 피크도 관찰되고, SnO2, SnS의 회절 피크는 관찰되지 않았다.In microgioxy (FIG. 4A), diffraction peaks of β-Sn and broad diffraction peaks of ZnS are shown. Therefore, it is understood that Sn is a crystal and ZnS is amorphous. After recording (FIG. 4B), it can be seen that the sharp diffraction peak of ZnS becomes strong and crystallization occurs. In addition, with respect to Sn is observed diffraction peak of β-Sn, SnO 2, SnS diffraction peak was observed.

예 4 (80:20)/Ti/(80:20)적층형)의 구조로 기록부분과 미기록부분을 X선회절에 의해 해석을 실시했다(도 5a, 도 5b 참조).Example 4 (80:20) / Ti / (80:20) laminated type) The recorded portion and the unrecorded portion were analyzed by X-ray diffraction (see FIGS. 5A and 5B).

미기록시(도 5a)에는 약간 ZnS의 브로드한 회절 피크가 보이고, Ti에 대해서는 회절피크는 보이지 않았다. 이 때문에 ZnS는 아몰퍼스인 것을 알 수 있다. 기록 후(도 5b)는 복수의 Zns의 회절피크가 보이게 되고, 결정화가 생기는 것을 알 수 있다. 또, Zn의 회절피크가 나타나고, 기록에 의해 ZnS와 Zn의 결정화가 진행되는 것을 알 수 있다.The broad diffraction peak of ZnS was slightly seen in the microgioxy (FIG. 5A), and the diffraction peak was not seen in Ti. For this reason, it turns out that ZnS is amorphous. After recording (FIG. 5B), the diffraction peaks of a plurality of Zns are seen, and it can be seen that crystallization occurs. In addition, a diffraction peak of Zn appears, and it can be seen that crystallization of ZnS and Zn proceeds by recording.

이상 설명한 바와 같이 본 발명의 광기록재생방법과 광기록매체에 의하면 환경에 부여하는 부하를 작게 하면서 단순한 구성으로, 또 지금까지 없었던 새로운 방법으로 데이터를 기록·재생할 수 있다.As described above, according to the optical recording and reproducing method and the optical recording medium of the present invention, data can be recorded and reproduced with a simple configuration and a new method that has never been achieved while reducing the load imposed on the environment.

Claims (5)

기판상에 적어도 기록보조층과 유전체층을 인접하여 존재시켜 형성한 기록층에, 외부로부터 기록되어야 할 정보에 따라서 강도 변조된 레이저빔을 조사하여, 상기 유전체층의 적어도 일부를 상태변화시키는 것에 의해 광학 특성을 변화시켜 정보를 기록하고, 또 이 광학특성의 변화에 따른 반사율의 변화를 판독하여, 상기 정보를 재생하는 것을 특징으로 하는 광기록재생방법.An optical characteristic is obtained by irradiating an intensity modulated laser beam in accordance with information to be recorded from the outside to at least a portion of the dielectric layer by irradiating a recording layer formed by adjoining at least a recording auxiliary layer and a dielectric layer on a substrate. Recording information by changing the information; and reading the change in reflectance according to the change in the optical characteristic to reproduce the information. 제 1 항에 있어서,The method of claim 1, 상기 유전체층의 상태변화는 결정성장인 것을 특징으로 하는 광기록재생방법.And the state change of the dielectric layer is crystal growth. 기판과, 적어도 상기 기판상에 인접하여 설치된 기록보조층 및 유전체층을 포함하는 기록층으로 이루어지며, 상기 유전체층은 상태변화를 일으키는 모재를 포함하며, 상기 기록보조층은 상태변화촉진재를 포함하여 이루어지며, 여기에 외부로부터 기록되어야 할 정보에 따라서 강도 변조된 레이저빔이 조사되고, 상기 모재가 상태 변화하는 것에 의해 레이저빔에 의해 판독 가능하게 반사율이 변화되고, 상기 정보의 재생이 가능해진 것을 특징으로 하는 광기록매체.A recording layer comprising a substrate, and at least a recording auxiliary layer and a dielectric layer disposed adjacent to the substrate, wherein the dielectric layer comprises a base material causing a state change, and the recording auxiliary layer comprises a state change promoting material. The laser beam is intensity modulated according to information to be recorded from the outside, and the reflectance is changed to be readable by the laser beam by the state change of the base material, and the information can be reproduced. Optical recording medium. 기판과, 적어도 상기 기판상에 인접하여 설치된 기록보조층 및 유전체층을포함하는 기록층으로 이루어지며, 상기 기록보조층은 Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, Mg, Mn, Ag, 중에서 선택되는 적어도 하나의 원소를 주성분으로 포함하는 것을 특징으로 하는 광기록매체.A recording layer comprising a substrate and at least a recording auxiliary layer and a dielectric layer disposed adjacent to the substrate, wherein the recording auxiliary layer is Sn, Ti, Si, Bi, Ge, C, V, W, Zr, Zn, An optical recording medium comprising at least one element selected from Mg, Mn, Ag, as a main component. 제 4 항에 있어서,The method of claim 4, wherein 상기 유전체층은 Al2O3, AlN, ZnO, ZnS, GeN, GeCrN, CeO2, SiO, SiO2, Si3N4, Ta2O5및 SiC로 이루어진 군에서 선택되는 적어도 1종류의 유전체재를 주성분으로 하는 것을 특징으로 하는 광기록매체.The dielectric layer may be formed of at least one dielectric material selected from the group consisting of Al 2 O 3 , AlN, ZnO, ZnS, GeN, GeCrN, CeO 2 , SiO, SiO 2 , Si 3 N 4 , Ta 2 O 5, and SiC. An optical recording medium comprising as a main component.
KR1020030034738A 2002-06-03 2003-05-30 Optical recording and playback method, and optical recording media KR100678300B1 (en)

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